if Request("something") == None: doesn't work

[Sam Sungshik Kong]

Hello!

I use Python for ASP programming.
I found something weird.

Response.Write(Request("something"))
It draws "None" when there's no value for something.
Actually I expect "" instead of "None".

So I changed it like
if Request("something") == None:
    Response.Write("")
else:
    Response.Write(Request("something"))

Strangely, the result of comparison is False.

if str(Request("something")) == "None":
works!

Also,
if len(Request("something")) == 0:
works!

What's wrong?

ssk